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author | Masahiro Yamada <masahiroy@kernel.org> | 2022-06-06 08:02:38 +0300 |
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committer | Wei Liu <wei.liu@kernel.org> | 2022-06-08 15:27:08 +0300 |
commit | 245b993d8f6c4e25f19191edfbd8080b645e12b1 (patch) | |
tree | bfeb7517e6c1679459e20f05978c49fc69a5eb98 /drivers/hv | |
parent | 92ec746bcea0c51cd29fb46e510fb71fe15282df (diff) | |
download | linux-245b993d8f6c4e25f19191edfbd8080b645e12b1.tar.xz |
clocksource: hyper-v: unexport __init-annotated hv_init_clocksource()
EXPORT_SYMBOL and __init is a bad combination because the .init.text
section is freed up after the initialization. Hence, modules cannot
use symbols annotated __init. The access to a freed symbol may end up
with kernel panic.
modpost used to detect it, but it has been broken for a decade.
Recently, I fixed modpost so it started to warn it again, then this
showed up in linux-next builds.
There are two ways to fix it:
- Remove __init
- Remove EXPORT_SYMBOL
I chose the latter for this case because the only in-tree call-site,
arch/x86/kernel/cpu/mshyperv.c is never compiled as modular.
(CONFIG_HYPERVISOR_GUEST is boolean)
Fixes: dd2cb348613b ("clocksource/drivers: Continue making Hyper-V clocksource ISA agnostic")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20220606050238.4162200-1-masahiroy@kernel.org
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hv')
0 files changed, 0 insertions, 0 deletions